Who cares if it's an "obscure academic acronym"? Nobody cares. "Laser" is an "obscure academic acronym", it didn't prevent it from catching on. In ChatGPT's case, you should ask around - people remember the name just fine.
What about all the people who mistakenly call it ChatGTP? (and yes I have heard this more than once in real life). I assume this is also the origin of the HN user with the same name.